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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

Conquest and controversy conclude the 2014 Rolex 24 at Daytona [spoilers]

If you don't wish to know who won the 2014 Rolex 24 at Daytona, you should avert your eyes right now. We'll even give you a double-space to skedaddle...
For those of you still with us, the first race in the United SportsCar Championship (USCC) is done, but the discussions about it certainly won't end for a while. Daytona Prototypes claimed the first four overall places, the top spot taken by the No. 5 Action Express Coyote-Chevrolet Corvette DP driven by Joao Barbosa, Christian Fittipaldi, Sebastien Bourdain and Burt Friselle. The 16th and final caution of the race bunched the field up for an eight-minute sprint to the flag, so the first place getter finished just 1.4 seconds ahead of the No. 10 Wayne Taylor Racing Dallara-Chevrolet Corvette DP driven by Max Angelelli. Third place went to Brian Friselle in the No. 9 Action Express Chevrolet Corvette DP, 20 seconds down. Chevrolet power hasn't taken the overall win since 2003, eleven years later it scores a one-two-three-four. The No. 6 Muscle Milk/Pickett Racing ORECA-Nissan 03 scored fifth place, the top LMP2 finisher.
The Prototype Challenge class win went to the No. 54 CORE Autosport team of Colin Braun, Jon Bennett, Mark Wilkins and James Gue.

GM CEO to meet with U.S. lawmakers over job cuts

WASHINGTON — General Motors Co Chief Executive Mary Barra plans to visit Capitol Hill next week to discuss the company's plans to halt production at five plants in North America next year and cut up to 15,000 jobs, two congressional aides said on Friday. GM has come under harsh criticism from lawmakers from both major political parties, and from President Donald Trump, since Monday when it announced the biggest restructuring for the U.S. No. 1 carmaker since its bankruptcy a decade ago. Barra is expected to meet with lawmakers from Michigan and Ohio, where GM plans to shutter three plants, as well as senior leaders in Congress. GM did not immediately comment. Barra has been calling lawmakers this week to explain the decision to end production. Trump has threatened to revoke subsidies for GM. The Detroit automaker plans to halt production next year at three assembly plants: the Lordstown small-car factory near Youngstown, Ohio; the Detroit-Hamtramck complex in Detroit; and the Oshawa, Ontario, assembly complex near Toronto. It will also stop building several models now assembled at those plants, including the Chevrolet Cruze, the Chevrolet Volt hybrid, the Cadillac CT6 and the Buick LaCrosse. Additionally, GM plans to shutter the Warren transmission plant outside Detroit and a plant that makes electric motors and drivetrains outside Baltimore, Maryland. The Cruze compact car will be discontinued in the U.S. market in 2019, although GM may continue building it in Mexico for other markets, Barra said. Reporting by David Shepardson. Related Video: